关于布局管理器FlowLayout的思考：如何让FlowLayout自动换行(1)

 今天上午没什么事儿，打开CSDN的BBS，发现有人在问一个关于布局管理器的问题，请看：关于布局的一个问题 。说实话，开始我并不相信楼主说的这句话“然后我在JPanel外面套了一个JScrollPane，却发现图片会一直往右边加，超出JPanel的宽度则出现横向的滚动条，与预想的效果相差较大。”

于是写下下面的代码：

 

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


public class SimpleTest extends JFrame{
    private ImageIcon image;
    private JLabel label;
    private JButton button;
    private JPanel buttonPanel, imagePanel;
    private JScrollPane scrollPane;
    private Container container;

    public SimpleTest(int xPixels, int yPixels){
        super("Add Image");

        button = new JButton("Add Image");
        image = new ImageIcon("C:/1.jpg");
        imagePanel = new JPanel(new FlowLayout(FlowLayout.LEFT, 5, 5));
        scrollPane = new JScrollPane(imagePanel);

        button.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                label = new JLabel(image);
                imagePanel.add(label);
                validate();
            }
        });

        buttonPanel = new JPanel(new GridLayout(1, 5));
        buttonPanel.add(button);

        container = getContentPane();
        container.setLayout(new GridLayout(2, 1));

        container.add(buttonPanel);
        container.add(scrollPane);

        setSize(xPixels, yPixels);
        setVisible(true);
    }

    public static void main(String[] args) {
        new SimpleTest(400, 400);
    }
}

 

 

输出请看图：